Baidu map API position offset calibration algorithm

Baidu map API position offset calibration algorithm

Algorithm language Software development 4 years ago (2016-02-17) Views: 896 Comments: 0

When starting to use the Baidu Maps API for development, you may encounter quite a strange thing. Using Baidu's latitude and longitude to locate on the map is quite inaccurate. This problem was encountered during the development of WeChat and Android.The first time using the Baidu map api to get the location and display it on the map is when the WeChat development, it is not knowing the specific reason but can't get an offset in the WeChat acquisition location to calibrate, although it can barely solve, but Not quite accurate.Later on at the beginning of Android also encountered this problem, only to find Baidu map API positioning offset is not an accidental problem. Baidu map API positioning offset reason The following is from the internet: First, the coordinate system First of all, we have to understand what coordinate systems developers can access? The first classification: 1, GPS, WGS-84, the original coordinate system.The coordinates recorded by an international standard GPS recorder are all GPS coordinates.Unfortunately, in China, GPS coordinates are not allowed on any of the map products. It is said to be confidential.The GPS coordinates are shown in the form of latitude and longitude in latitude and longitude: 2,

Android (Java) parsing way translation API – Json data

Android (Java) parsing way translation API – Json data

Software development 5 years ago (2015-08-24) Views: 12 Comments: 0

Since Baidu Translation, Youdao Translation, and other translation services all open their own APIs, developers can develop their own translation software using the API they provide.The software developed by oneself may not be as powerful as their functions, but the result of the translation is the same. At the same time, other processes that sneak traffic are not built in. At the same time, the interface is relatively simple and can be modified as desired. First, after applying the API ID and KEY to the API, the client ID and clientSecret in the following program are replaced with the ID and KEY, and the string is parsed through the GET request.Here is the code that I used to parse JSON data in java: Android (Java) parsing way translation API - Json data  

Baidu face recognition service opened for the first time

Baidu face recognition service opened for the first time

Algorithm language 5 years ago (2015-08-08) Views: 361 Comments: 0

This article is from the very guest from: Chinese Science and Technology News Citnews Technology Information Network On July 24th, Baidu Institute of Deep Learning Labs (IDL) announced that its proprietary Baidu face recognition technology has been freely opened to the public through the APIStore. In recent years, with the rapid development of mobile Internet, Internet+ is infiltrating all walks of life.For businesses that need face-to-face identity verification, whether or not they can use the machine to automatically do authentication will become the key to Internet+ landing.Deep learning brings the continuous advancement of face recognition technology, making it possible for machines to recognize people's identities.In particular, face recognition technology based on deep learning has greatly exceeded the traditional method of pattern recognition.In the application scenarios such as online account opening, mobile payment, and face login, how to use reliable and efficient face recognition technology to replace the traditional manual review is a very popular application direction in the current Internet industry. Founded in 2012, Baidu Deep Learning Lab has accumulated a great deal of data and technical experience in face technology since its inception.Prior to this, the face recognition technology of the deep learning laboratory was only provided to Baidu’s

PHP to achieve hotel query: WEB + SQL database + JSON-API

PHP to achieve hotel query: WEB + SQL database + JSON-API

Algorithm language 5 years ago (2015-07-27) Views: 60 Comments: 0

Project Restatement: PROBLEM : HOTEL RESERVATION A hotel chain operating in Miami wishes to offer room reservation services over the internet. They have three hotels in Miami: Lakewood, Bridgewood and Ridgewood. Each hotel has separate weekday and weekend (Saturday and Sunday) rates. There are special rates for rewards customer as a part of loyalty program. Each hotel has a rated assigned to it. Lakewood with a rating of 3 has weekday rates as 110$ for regular customer and 80$ for rewards customer. The weekend rates are 90$ for regular customer and 80$ for a rewards customer. Bridgewood with a rating of 4 has weekday rates as 160$ for regular customer and 110$ for rewards customer. The weekend rates are 60$ for regular customer and 50$ for a rewards customer. Ridgewood with a rating of 5 has weekday rates as 220$ for regular customer and 100$ for rewards customer. The weekend rates are 150$ for regular customer and 40$ for a rewards customer. Write a program to help an online customer find the cheapest hotel. The input to the program will be a range of dates for a regular or rewards customer. The output should be the cheapest available hotel. In

Talk about web API

Talk about web API

computer technology Geek Viewpoint 5 years ago (2015-06-27) Views: 9 Comments: 0

In particular, since the popularity of the WeChat public platform, network APIs have become more and more popular.Internet enthusiasts who do not have any technology and resources can build their own public numbers through free and open APIs on the Internet, and their functions can also be quite powerful, such as checking the weather, checking stocks, checking train tickets, chatting and telling jokes, and checking IP addresses. Mobile phone ownership... Of course, the use of network APIs is not limited to WeChat development. It can also be applied to mobile software development such as Android. A lot of software has weather inquiries, but not all weather software developers have weather satellites and ground stations in their “home”; many softwares provide targeted services based on the location of users: for example, you want to use When you're hungry, you can order a fast food. It can find restaurants near you based on your location. You use a group to buy movie tickets for nearby movie theaters. Now the question is: Do you feel hungry? The map system?Nowadays, the well-known map applications in China include the Gaode map and Baidu map. Both provide APIs for positioning, navigation, and related developer SDKs and

WordPress function hook (Hook) (3)

WordPress function hook (Hook) (3)

Hundred Encyclopedias 5 years ago (2015-05-29) Views: 10 Comments: 0

Management interface related Activate_ (plugin file name) This action function is executed the first time a plugin is activated.See the commonly used function -register_activation_hook. Activity_box_end This action function is performed at the end of the active box on the dashboard interface. Add_category_form_pre This action function is executed when the added category text box is not displayed on the interface of the management menu. Admin_head Perform this action function in the <head> HTML block of the dashboard. Admin_head-(page_hook) or admin_head-(plguin_page) This action function is executed in the HTML section <head> of the dashboard of the page generated by the plugin. Admin_init Perform this action function before loading the management interface.See wp-admin/admin.php, wp-admin/admin-post.php, and wp-admin/admin-ajax.php. Admin_footer This action function is performed at the end of the dashboard in the main tab. Admin_print_scripts This action function is executed in the header portion of the HTML to allow the plug-in to add JavaScript scripts to all management interfaces. Admin_print_styles This action function is performed in the header portion of the HTML to allow the plug-in to add CSS or style sheets to all management interfaces. Admin_print_scripts-(page_hook) or admin_print_scripts-(plugin_page) This action function is executed to input the JavaScript script into the HTML message header portion

WordPress function hook (2)

WordPress function hook (2)

Hundred Encyclopedias 5 years ago (2015-05-29) Views: 4 Comments: 0

Backlink action hook function Add_link This action function is executed when the new backlink is added to the database for the first time.Function received parameters: link ID. Delete_link Perform this action function when deleting a backlink.Function received parameters: link ID. Edit_link Perform this action function when editing a backlink.Function received parameters: link ID. Feed action hook function Atom_entry In the atom subscription, after displaying a blog post (but before closing the log tag), this action function is executed. Atom_head In the atom subscription, after displaying the subscribed blog information, the action function is executed before the first blog of the blog is displayed. Atom_ns performs this action function (to add a namespace) for the root XML element of the atom subscription. Commentrss2_item In the comment subscription, after displaying a piece of comment information (but before closing the tag of the comment), this action function is executed.Function received parameters: comment ID, log ID. Do_feed_(feed) This action function is executed when the subscription information is generated. The subscription refers to the subscription type (rss2, atom, rdf, etc.).The priority for displaying subscription information should be less than 10.The parameters received by the function: true (comment subscription), or false (log subscription). Rdf_header In the

WordPress function hook (1)

WordPress function hook (1)

Hundred Encyclopedias 5 years ago (2015-05-27) Views: 13 Comments: 0

An action hook that runs in a typical request When a logged-in user opens the site home page in the default theme, WordPress runs the following action hook function: Plugins_loaded Sanitize_comment_cookies Setup_theme Auth_cookie_malformed Auth_cookie_valid Set_current_user Init Widgets_init Parse_request Send_headers Pre_get_posts Posts_selection Wp Template_redirect Get_header Wp_head Wp_print_styles Wp_print_scripts Loop_start Loop_end Get_sidebar Wp_meta Get_footer Wp_footer Second, log, page, attachment and category-related action hook function Add_attachment When the attachment file first joins the database, the add_attachment function is executed.Function received parameters: Attachment ID. Add_category Same as create_category. Clean_post_cache When clearing the log cache, execute this action function.Function received parameters: log ID.See clean_post_cache(). Create_category When a new category is generated, this action function is executed.Function received parameters: Category ID. Delete_attachment After removing a category from the database and the corresponding link/log, execute the action function.Function received parameters: Category ID. Delete_post This action function is executed when a log or page is to be deleted.Function received parameters: log ID or page ID. Deleted_post After deleting a log or page, execute the action function.Function received parameters: log ID or page ID. Edit_attachment This action function is executed when the attachment file in the database is updated.Function received parameters: Attachment ID. Edit_category When you update/edit a category

Relying on Web Hosting to Provide Software Update Service for Homemade APPs (1)

Relying on Web Hosting to Provide Software Update Service for Homemade APPs (1)

Software development 5 years ago (2015-04-21) Views: 8 Comments: 0

After learning one month of Android, I wrote a few small programs and I always felt that something was missing.Seeing that the software on the general market provides software update services, most guests want to have a virtual host. Can they build a software update server by themselves?Baidu took a look at “relying on virtual hosts to provide software update services for self-made APPs.” Unfortunately, searching for Baidu has not found a solution yet. To implement software updates, there must be a comparison between the latest software version number published on the server and the version currently used on the client.If the version number is the same, the user is prompted to "currently the latest version"; if the latest version published on the server is higher than the one used by the user, the "version update" is prompted and the download function is provided, and the installation is automatically performed after the download is completed.To get the latest version number, you must read the database. If you directly connect the database directly with the user's password, this is undoubtedly insecure, because if you decompile or crack your software, your database will be desperate.So, the solution I came up with was

PHP json_encode conversion array Chinese garbled

PHP json_encode conversion array Chinese garbled

Software development 5 years ago (2015-04-05) Views: 294 Comments: 0

Because in the Android software development practice, the author wanted to add software update services to the software, so decided to rely on their own virtual host, use php to create an own API.Then output the query result of the database through the json standard format. First, examples show The simple form of API production code is:The jsons_encode function to convert the array to json format will find the Chinese garbled shape like this: u901au8bafu5f55uff0cu662fu738bu67cfu5143u81eau4e3bu5f00 After the database was coded, the author discovered that this was a problem with the jsons_encode function. The causes were as follows: Second, the reason analysis: MySQL does not store unicode characters when storing into a database: MySQL only supports basic multilingual flat characters (0x0000-0xFFFF).Try to store a synonym instead Update: On MySQL 5.5.3 (which hasn't GA yet), support for supplemental characters if you use UTF8MB4 encoding. When json_encode is in Chinese, each Chinese character is encoded into "uxxxx", and when it is stored in the database, "" is blocked and becomes "uxxxx" directly. Third, solve the problem: 1. Avoid json_encode converting Chinese unicode encoding. PHP5.4 has added an option to Json: JSON_UNESCAPED_UNICODE.Adding this option will not automatically encode Chinese. $json= json_encode("Wang Baiyuan's blog", JSON_UNESCAPED_UNICODE);

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